Drill press



R. A. BRASWELL I 2,580,398

DRILL PRESS Jan. 1, 1952 Filed Nov. 17, 1949 B'SheetS-Sheet 1 T l I |.I Roy A. Braswel/ INVENTOR.

Jan. 1, 1952 R. A. BRASWELL 2,580,393

I DRILL PRESS Filed Nov. 17, 1949 5 Sheets-Sheet 2 u|||||||| IIIIIIV sea m5 76 1/2 6 Roy A. Braswe/l v INVENTOR.

BY WW 5% Jan. 1, 1952 R. A. BRASWELL DRILL PRESS 3 Sheets-Sheet 3 Filed NOV. 17, 1949 R I t S V mm a B M A u w 9% Patented Jan. 1, 1952 U NITED- STATES F ICE "DRILL muss: Boy Ab lira swell, Aldersombkla. Applicationhlovember 17, 1949, 'Serial No. 127,925

8 Glaims. 1

This invention relates to new and useful improvements in drill presses and the primary object of the present invention is to provide a hollow, open ended, rotary bit through which a gas is directed, the gas being ignited at the tip of the bit to permit the-bit to pass through work in a minimum time;

Another important object of the present invention is to-pro'vide a bit-of the aforementioned character and a traveling holder for the bit that 'willmove at a predetermined speed toward the article being worked;

Yet another object oi the presentinvention is to provide a drill press including a hollow, open ended, bit through which a gas is directed to he ignited at the top of the bit, the bit being rotated at high speed'to effect a whirling of thegas discharged from the bit to permit the bit to drill a hole in metal similar to an acetylene cutting torch and since the bitis rotating the hole formed will be free of clinging fragments,

Another object of? the present invention is to provide a bit that is constructed to function as the tip on a gas burning torch and which hit is also energized by electric means when an arc 'isstruck to further reduce the normal timeire quired forcutting or drilling metal.

A further object of the presentinvention. ist'o provide an apparatus for drillin .holes and which is adaptable, with slight modifications, for both arc and, acetylene cutting.

. V A. still further aim of the present invention is to provide adrill press that is simpleandpractical in construction, strong and reliable in use,

neatv and attractive in: appearance, highlyeffi-= cient and durable; inoperation, relatively. inexpensive toflmanufacture and service, and otherwise well adapted for the purposes for whichthe same is intended.

Otherobjects and advantages. reside in. the

details oi, construction and operation as more fully hereinafter, described: and. claimed, reference: being had. to the accompanying drawings forming part hereof, wherein like numerals-refer to like; parts throughout, and in which:

Figure 1 is a .plan view of the present invention;

Figure 2 is; an enlarged, longitudinal vertical sectional view taken substantially on theiplane of section line 22 of Figure 1;

Figure 3 is anelevatlonal viewrof Figure" 1;

Figure. iris an enlarged, longitudinal= vertical sectional: viewv showing, the, hollow' bit andbit holder;

Figure 5 is an elevational view; similar to.-Fig-,

, ergizing the rotary bit when an arc is struck to ill) perforni the drillin Figure eis an enlarged, transverse horizontal sectional view taken substantially on the plane of secti'on line 8-6 of Figure 5;

Figure '7 is an elevational view of the present invention in modifiedform;

Figure 8 is a view taken {substantially in the direction of arrownumbered 8 in Figure 7, and with parts broken away for the convenience of explanation; and,

Figure 9 is a detailperspecti've View showing an alternativemethod-"for energizing the rotary bit by electric means.

- Referring now to the drawings in; detail, and more particularly to Figures I-S inclusive, wherein for the purpose of illustration, there is disclosed one embodiment of the present invention. The instant structure anticipates the use of an elongated hollow, open ended, bit to having a tap'e'red' -ti'p' 12'. The bit I!) is rotated at high speed and 'is moved-longitudinally toward an artiele-being workedl Gas is directed through the bit and ignited at the tip l2 so that the apparatuswillfunction' as a rotatable and movable metal cutting tonhiaddition to the g operable runcucn of the instant metal: Wol -king machine, there is also provided a means wherebythe hit lo, or a similar bit, may be heated electrically. Therefore, the. present machine contem lates the use of either or both gas and electricity for creating the heatrequired for cutting (Jr-drilling metal.

Figures i-4" inclusive dealv with the present metal working machine assembled for use with gasand'. this 'specifi'oconstruction will first be clescribedfinde'tail fromiwhence adescription of the electrical heating meansof Figures 5 and 5 will follow together withiaildiscussioniof the machine assembled for utilizing both gas and electricity.

. Ahousing: ltisdetachably secured to and rises from asuitable base It through the. mediiiinor fasteners or bolts l8. Upper andlower heal .2'0 and 2-2,. mounted on the'respective upper and lower walls of the housing I4 receive the reduce-ii endl'portions'ofia threadedishaft' or: worn as that is-spacedpai allel to one sidewall 2550f the hous mg" ll.

Journaled: forirotation in bearings 25' on upperwall'of the housing this athreaded. drive shaft or worm 30 that engages a gear 32- on the upper endio'f theshaft 2-4. The shaft ismanually: rotatedlby ahand w-heel 3'4at-one end of the shaft: 30.

A tool holder 36 is associated with the housing I4 and more particularly the shaft 24. The tool holder includes a traveling member or block 38 having an internally threaded bore 40 that receivably engages the shaft 24. One leg portion of an angle member or bracket 42 is removably secured to one face of the block 38 and the other leg portion of the bracket 42 is slidably received in a vertical slot 44 formed in the wall 26.

The leg portions of the bracket 42 are connected and braced by an arm 46 and a belly band or strap 48 is secured to the bracket 42 exteriorly of the housing I 4. The band 48 embraces a motor 50 having a depending drive shaft 52 that is coupled by a sleeve or collar 54 to the upper section 56 of a sectional bit holding member 53. -The collar 54 receives the lower end of the shaft 52 and is held against rotation relative to the shaft 52 by a set screw 60 as shown in Figure 4. The lower end of the collar 54 is internally threaded to receivably engage the upper externally threaded end of the section 56.

The lower end of the section 56 is provided with a recess or depression 62 that receives the upper reduced end portion 64 of the lower section 66 of the member 58. The joined ends of the sections 56 and 66 are received within a housing or casing 68 having removable upper and lower walls '52 and 72. Upper and lower sleeves l4 and i6, integrally formed with the walls l and i2, respectively, journally receive the sections 56 and 16.

Flanges I8 and 80 are provided on the sections 56 and 66, respectively, and rest against suitable bearing races 82 and 84 mounted on the walls 16 and T2. The flan es I8 and 80 are positioned within the casing 68 and are urged against hearing races 82 and :34 by a coil spring 66 that embraces the adiacent ends of the sections 56 and 66 and which is biased between the flanges 18 and 80 to permit the sections and 66 to rotate as a unitary structure relative to the casing 66.

A gas delivery conduit 88 leading from a source of gas, such as the gas used in acetylene torches, is connected to the casing 66. The section 66 is tubular and includes slots 90 adiacent its reduced end 64 so that gas-entering the casing 66 will exit through the section-66 and the bit I0 that is threaded to the lower end of the section 63.

A strap 92 is disposed about and held on the casing 68 by any suitable means, such as set screw 93, and this strap 92, is secured to hanger arms 94 depending from the motor embracing band 48. i i

In practical use of the present invention thus described, gas is fed into the casing 68 and through the section 66 and bit I0 as the tool holder 36 is lowered by a rotation of the shaft 24.

The gas is ignited at the tip I 2 and the bit I 0 is rotated by the drive shaft 52 of motor 50 to effectively and rapidly cut metal or drill metal supported upon the base I6.

Obviously, suitable packing glands may be associated with the sleeves I4 and was well as the parts of the casing 68 in order to prevent the seepage of gas from the casing other than through the section 66. j

The section 56 is provided with a multi-sided portion 96 and the bit I0 is, also provided with a multi-sided portion 98 that will permit a wrench or the like to be employed during securing of the section 56 to the collar and the bit I0 to the section 66.

When the bit I0, .or a suitable bit,i is to be heated by electrical means, asshown in Figures 5 and 6, a conductive member 99 surrounds the upper end of bit I0 and is embraced by a clamp having similar halves I00 and I02. The halves I00 and I02 are slidably joined by bolts I04 and springs I06 embracing the bolts I04 and biased between abutments I08 on the bolts and one of the halves I00 yieldingly urges the halves together to clampingly grip the member 99 A further bolt or arm IIO projects laterally from the half I02 and is connected to the strap 92 by a non-conductive plate II2. A non-conductive connector I I4 between the bit I0 and section 66 is also provided.

In practical use of the present invention described in Figures 5 and 6, the bolt H0 is connected to either a ground line of a hot line and the article being worked is connected to either a hot line or a ground line (depending on the line used with bolt H0), it being understood that the bit I0 is of a suitable heat retaining mate rial such as carbon, tungsten, Nichrome, or platinum.

It is thus observed that as the bit is rotated to drill or cut the same will be heated to reduce the normal time required for drilling or cutting metal.

Since it is possible to both ignite the gas leaving the tip I2 of the bit and also heat the bit, both of these features can be simultaneously employed to produce the end result of cutting or drilling metal though in some instances it may be necessary to use a conductive element to bridge the gap between the work and the bit. 1 Reference is directed to Figures 7 and 8 wherein there is disclosed a portable metal working machine patterned after the machine previously described since it employs a hollow bit 200, a means 202 for rotating the bit, a holder 204 for the bit and a support 206 slidably receiving the holder 204.

The bit rotating means 202 is a motor 208 having a depending drive shaft 2|0 that is coupled by a collar 2II to the upper end of an upper bitholdin member section 2I2. The section 2I2 is connected to the upper end of a lower bit holding member section 2I4 for rotation therewith and the adjacent ends ofthe sections 2I2 and 2I4 are positioned in a casing 2I6 that is connected to a source of gas by a conduit 2I8.

A band 220 embraces the motor 202 and arms 222 depending from the band 220 support a ring 224 that is threaded on the arms 222. The support 206 consists of upper and lower circular members 226 and 228 that are Joined by connecting strips 230.

Lugs 232 project laterally from the casing 2I6 and are slidably received in vertical slots 234 provided in the member 226. A coil spring 236 embraces the casing 2I6 and the upper section 2I2 and this spring is biased between the upper member 226 and the ring 224 to yieldingly support the motor 202, casing 2I6 and bit 200 raised relative to the support 206 so thatpressure'will be re"- quired to move the bit 202 toward the article being worked.

A non-conductive strip 238 is suitably secured to lower ends of the arms 222 and is also secured to a bolt 240 projecting from a clamp 242 that embraces a conductive collar 244 on the bit 200.

The operation of this apparatus, as described in Figures '7 and 8, is similar to that described in Figures 1-6 inclusive and may be used with gas, electricity or both with the bolt 240 and the article being worked connected to-the positive and negative poles of a welding machine.

The lower edge of the member 228 is provided with a plurality of circumferentially spaced recesses that receive magnets 248 tending to retain the member 228 relative to metal while drilling to thereby aid the stability of the apparatus.

Figure 9 shows a collar 300 on the upper end of the hollow bit 302 and a clamp 304 about the collar 300. An arm B extending from the clamp 304 is connected to a bracket 308 on a supporting structural element 3l0 by a non-conductive strip 312. when the bit is held relatively stationary and the work is to be fed thereto. The work and the bit are connected to an electric means of opposite polarity such as the poles of a welding machine.

By replacing the bit l0 with a welding rod of proper construction, the instant machine can be used to weld electrically and spot weld and braze. The portable model may also be used in the same manner and by replacing the bit 302, in Figure 9, with a welding rod it may also be used for welding, spot welding and brazing by means of elevation and depression of hand wheel.

In view of the foregoing description taken in conjunction with the accompanying drawings it is believed that a clear understanding of the device will be quite apparent to those skilled in this art. A more detailed description is accordingly deemed unnecessary.

It is to be understood, however, that even though there is herein shown and described a preferred embodiment of the invention the same is susceptible to certain changes fully comprehended by the spirit of the invention as herein described and the scope of the appended claims.

Having described the invention, what is claimed as new is:

1. A machine for making holes in metal, said machine comprising a motor mounting, means operatively connected to said mounting for selectively raising and lowering the latter, hanger straps depending from the mounting, a sleeve carried by said straps, a housing member embraced by said sleeve and having an inlet port, a pair of shafts connected together for unitary rotation and extending through the member, one of said shafts being hollow and having openings therein to receive gas passing into the housing member, a motor supported by said mountin and operatively connected to said shafts. and a resilient connection between said shafts.

2. The combination of claim 1 wherein said shafts include inner adjacent ends positioned in said housing member, a flange on each shaft and positioned in said housing member, said resilient connection including a spring within said housing member embracing said adjacent ends of said shafts and biased between said flanges.

3. The combination of claim 2 wherein said housin member includes upper and lower walls, an upper ball race supported by said upper wall and within said housing member and a lower ball race supported by said lower wall and within said housing member, said spring urging said flanges against said ball races.

4. The combination of claim 1 having a hollow bit carried by said hollow shaft and communicating with the interior of the latter and an electrical means for heating said bit, said heating means consisting of a conductive clampin member clamped about said bit, and a hanger depending from said sleeve and supporting said clamping member.

5. A machine for making holes in metal, said machine comprising a. motor mounting, means This latest construction is utilized operatively connected to said mounting for selectively raising and lowering the latter, hanger straps depending from the mounting, a sleeve carried by said straps, a housing member held within said sleeve, upper and lower coaxial shafts having adjacent ends extending into said housing member, a resilient connection between said shafts and disposed within the housing member, a motor supported by said mounting and operatively connected to said upper shaft, a bit carried by the lower shaft, and means operatively connected to said bit for heating the latter.

6. In a drilling machine including a driving shaft, a bit holder comprising a housing member having first and second end walls, a first driven shaft coupled to said driving shaft and extend ing through the first end wall of said member, a second driven shaft extending through the second end wall of said member, means centering said second driven shaft with respect to said first driven shaft, a first flange on the first driven shaft and positioned in said member, a second flange on said second driven shaft and also positioned in said member, anti-friction means between said first flange and the first end wall of said member, additional anti-friction means between said second flange and said second end wall, and a spring within said member and embracing said driven shafts and biased between said flanges to yieldingly urge the flanges away from each other.

7. The combination of claim 6 wherein said second driven shaft includes an axial bore and a slotted end whose slots intersect said bore, the slotted end of said second driven shaft being disposed in said member, said member having an inlet port.

8. A machine for making holes in metal, said machine comprising a hollow open-ended bit, a movable holder for the bit, means associated with the holder for rotating the bit, means guiding the holder during its movement, means for moving the holder, and means operatively connected to the bit for heating the latter, said holder in cluding a gas-tight enclosing housing having upper and lower walls and a pair of coaxial shafts including adjacent ends extending through the upper and lower walls and into the housing, the adjacent ends of said shafts being engaged one within theother, abutments on said adjacent ends and located within the housing, and a spring embracing said adjacent ends and biased between said abutments to yieldingly connect said shafts, one of the shafts being connected to said bit rotating means and the other of said shafts being tubular and having openings in its end positioned in the housing and having said bit attached at the other end of said shaft, and a conduit attached to said housing for supplying a gas to the housing, whereby gas may be supplied through the hollow shaft and bit.

ROY A. BRASWELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 866,866 Jottrand Sept. 24, 1907 884,762 Risting et al Apr. 14, 1908 1,554,407 Coberly Sept. 22, 1925 1,752,690 Ost Apr. 1, 1930 2,385,665 Warwick Sept. 25, 1945 2,436,251 Dobie et al Feb. 17, 1948 2,485,361 Condit et al Oct. 18, 1949 

